2 cups granulated sugar
1 teaspoon salt
6 tablespoons unsalted butter
1 cup heavy cream
5 cups mini marshmallows (8 ounces)
1 teaspoon pure vanilla extract
3 cups semisweet or bittersweet chocolate (20 ounces)
Line a 9 x 13-inch pan with enough parchment or waxed paper to overhang at least an inch over the edge and butter or spray with cooking spray; set aside.
In a medium saucepan, combine the sugar, salt, butter, cream, and marshmallows. Bring mixture to a boil; and then cook, stirring constantly, for 5 minutes. Remove from heat. Add vanilla and chocolate; stir until completely smooth. Pour immediately into prepared pan; let cool, 3 to 4 hours.
When fudge is firm, use paper to lift fudge onto a cutting board and cut into serving pieces.
Makes 48 pieces.